C interface

Next to the existing Python and C++ APIs, the iKnow engine is now also available through a simple C interface. This allows embedding the iKnow engine in virtually any environment. The new API uses a simple JSON format for input and output, but otherwise has a very similar feature surface to what you're familiar with from the iknowpy package. Please see the wiki for more details.

This release also includes a significant update of the Japanese language model.